| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| VASCONCELLES MICHAEL | Head of Research and Dev. | C/O DAY ONE BIOPHARMACEUTICALS, INC., 1800 SIERRA POINT PARKWAY, SUITE 200, BRISBANE | /s/ Charles N. York II, as Attorney-in-Fact | 18 Jun 2025 | 0001734755 |
No securities are beneficially owned.